Work-holding mechanism for metal-working machines.



BEST AVAILABLE COPY No- 892,927. PATENTED JULY 7, 1908. B. W. BBMIS. WORK HOLDING MECHANISM FOR METAL WORKING MACHINES.

APPLICATION FILED DBC.20,1900.

2 SHEETS-SHEET 1.

1 [El i v -l Wihnesses Inverd or I B I Edgar' BeYr is. W. 9 {3 orney No. 892,927. PATENTED JULY 7, 1908. E. W. BEMIS.

WORK HOLDING MECHANISM FOR METAL WORKING MACHINES.

APPLICATION FILED DEG.29, 1906.

I 2 SHEETSSHEET 2.

55 VVELI, y! I Witnesses F Inuen um o wm/m. fi

B ,6 Ma MW u X UNITED STATES PATENT OFFICE.

EDGAR W. BEMIS, OF WORCESTER, MASSACHUSETTS.

WORK-HOLDING MECHANISM FOR METAL-WORKIN G MACHINES.

To all whom it may concern:

Be it known that I, EDGAR WV. BEMIs, a citizen of the United States, residing at WVorcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in Work-Holding Mechanism for Metal-l/Vorking Machines, of which the following is a specification, accompanied by drawings formin a part of the same, in which-- Figure 1 is a side view of a multiple drill embodying my invention, the work holding mechanism being adapted to hold a series of revolver cylinders during the operation of drilling. Fig. 2 is a view partly in section showing the gearing between the main shaft and the cam shaft. Fig. 3 is a side view of the cam. Fig. 4 is a top view of the chuck holding table. Fig. 5 is a central vertical sectional view of one of the chucks detached, and Fig. 6 is a side View of a portion of a multiple drill with the drill spindles removed and with the work table and supporting post shown in section.

Similar reference letters and figures refer to similar parts in the difi'erent views.

My invention relates to work holding means for multiple drills and similar machines, comprising means for holding a number of pleces of work to be drilled simultaneously, means for bringing each piece successively beneath each drill and means for changing the position of each piece with reference to the axis of the drill shaft as it comes beneath each drill; and it consists in the construction and arrangement of parts as hereinafter described and pointed out in the annexed claims.

Referring to the accompanying drawings 1 denotes a base plate to which is bolted a hollow 0st 2 split for a portion of its length, and inc losing a sleeve 3, the post 12 being provided with a bolt 4 in order to draw the s lit portion together, take up wear, and alow a free vertical sliding movement to the sleeve 3. Integral with the sleeve 3 is a table 5 provided with the usual exterior annular trough 6 for oil. Mounted on balls 7 on an annular track 7 u on the table 5 is a rotatable turn table 8. The sleeve 3 extends above the table 5 and is provided with a stationary gear 9 concentric therewith. Arranged concentrically with the turntable 8 are bearings 10 in which are mounted s indles 11 carrying pinions 12 which engage t e stationary gear 9. The turntable 8 is Specification of Letters Patent.

Application filed December 29, 1906.

Patented July '7, 1908.

Serial No. 349,995.

rotated by the operator and is provided with equidistant notches 13, one of which is engaged by a spring actuated catch 14 on the stationary table 5.

Mounted on the upper end of the spindles 11 are the chucks 15 one of which is shown in Fig. 5, comprising tapering jaws 16, a tapering sleeve 17 on a screw threaded base 18. This chuck is designed to hold the cylinder of a revolver during the boring of the spindle and the chambers, but it is obvious that the character or style of work is immaterial. Held concentrically within the post 2 is a hollow post 19 which extends above the turntable 8 and is provided with arms 20 which support the bearings for the drill spindles 21, provided with drills 22 equal in number to the chucks 15. The post 19 and bearings are so arranged that each drill 22 is in a certain position with relation to the corresponding chuck 15 when the turntable 8 is held from rotation by the catch 14, so that when the turntable is lifted to bring the work in engagement with the drills 22 each drill will bore a hole in a predetermined position in the piece of work held by the corresponding chuck.

Each drill spindle is provided at its top with a gear 23 which is driven from a central gear 24 on a shaft 24 as is usual in gang drills of similar construction. The vertical shaft 24 is supported by a collar 25 bolted to the post 2 and is provided with a bevel gear 24 at its lower end which is driven by a bevel gear 26 on a horizontal driving shaft 26 provided with the usual tight and loose pulleys 27 and 28. The shaft 26 is also provided with a spiral gear 29 which meshes with a horizontal spiral gear 30 on a vertical shaft 31 held in bearings 32, attached by arms 33 to a post 34 bolted to the base 1. Upon the vertical shaft 31 is a worm 35 which engages a worm gear 36 on a cam shaft 37. By means of a sliding clutch 38 having a spline connection 39 with the cam shaft 37 a cam 40 may be connected at will with the cam shaft 37 by the lever 41 and rod 42. The cam 40 is provided with a cam slot 43, shown in Fig. 3, which is provided with a cam roll 44 connected by a vertically reciprocating rod 45 and link 46, with one end 47 of a forked arm 48 pivotally connected by a link 49 with the frame work. The forks 50 of the arm 48 are connected by lugs 51 with the table 5 which therefore receives a vertically reciprocating motion by the rotation of the cam 40. The pivotal connection of the lugs 51 with the forked arm 48 holds the table 5 and connecting sleeve from rotation within the hollow post 2.

In the present instance the cam slot 43 is so arranged that the table 5 receives during one revolution of the cam a slow rising movement, during which tilne the drills engage the work, a quick return to the lowest limit of movement, and a period of dwell to allow for manipulation of the work upon the turntable.

My multiple drill is shown as applied to the work of boring the chambers and the spindle hole in the cylinder of a revolver, but it is obviously applicable to many other purposes.

In boring a revolver cylinder, a cylinder is first placed in one of the chucks at A, Fig. 4, during the dwell of the table 8 at its lowest point, and the center or spindle hole A of the cylinder is bored during the revolution of the cam 40 which raises the cylinder into contact with a drill and returns it to its lowest position. During its period of dwell the operator releases the spring catch 14, revolves the turntable 8 in the direction of the arrow at Fig. 4, until the catch 14 engages the next notch, and puts in a new cylinder in the chuck. As the cam revolves the table is lifted and the cylinders carried into engagement with the drills causing a chamber B to be bored in the cylinder in its second position while a spindle hole is bored in the newly inserted cylinder. Continued rotation of the cam lowers the table 8 which is again revolved the distance of one notch and a third unbored cylinder placed in the next chuck. As the pinions 12 on the spindles 11 are in engagement with the stationary pinion 9 on the sleeve 3, it is obvious that a partial rotation of the turntable 8 will also partially rotate each chuck 15 so that the drills for the chambers may be concentric and yet by the partial rotation of the chucks 15 bore an additional chamber in the cylinders each time the turntable 8 is lifted. When, therefore, the turntable 8 has completed a revolution the cylinder first inserted is finished, having received the spindle hole and the desired number of chambers as the turntable 8 was rotated. The attendant, to continue the V drilling operation, has now merely to release the turntable, rotate it until the catch engages the next succeeding notch, remove the completed cylinder and insert an undrilled one. This operation is performed during the dwell of the table 8 at its lowest point and the drilling of a hole in each cylinder is accomplished at each rising movement of the table 8. The spindles 11 extend upward at 52 into the interior of the chucks 15 and serve as stops to limit the insertion of the revolver cylinders 53. The upper ends of the spindles 11 are counterbored at 54 to receive the end of the drill for drilling the center hole in the cylinder. At each angular movement of the turntable after the chucks have been filled a hole will be bored simultaneously in each cylinder, one drill boring the center hole A and the remaining drills boring the chamber holes B, O, D, E, and F completing the boring of the cylinder I claim,

1. In a machine of the character described, the combination of a hollow vertical post, a sleeve held from rotation in said post and projecting above its upper end, a table projecting radially from said sleeve and rovided with an amiular track for a turnta ble, a turntable supported by said radial table, a series of rotatable work holding chucks held concentrically in said turntable, and provided with pinions, a fixed gear held on said sleeve and engaging said pinions, a series of drill spindles in alinement with said chucks, and means for raising and lowering said sleeve and connected parts.

2. In a machine of the character described, the combination of a vertical hollow post, a shaft j ournaled concentrically in said post, a series of drill spindles concentric with said shaft and operatively connected therewith, a sleeve held from rotation in said post, a table supported by said sleeve, a turntable supported on said table, chucks carried by said turntable in alinement with said drill spindles, and means for raising and lowering said sleeve and connected parts.

3. In a machine of the character described, the combination of a hollow vertical post, a shaft journaled concentrically in said post, a series of drill spindles operatively connected with said shaft, a sleeve held by said post, a table supported by said sleeve, a turn table supported on said table, chucks carried by said turn table in alinement with said drill spindles.

4. In a machine of the character described, the combination with a hollow vertical post, a vertically movable spindle held by said post and projecting above its upper end, a table projecting radially from said spindle and provided with an annular track for a turn table, a turn table supported by said radial table, a series of rotatable work holding chucks, means for rotating said chucks, and means for raising and lowering said radial table.

5. In a machine of the character described, the combination of a vertical hollow post, a vertical shaft ournaled in said post, a series of drill spindles mounted on said hollow post and operatively connected with said shaft, a driving shaft connected with said vertical shaft, a cam shaft operatively connected with said driving shaft, a chuck holding table capable of a vertical movement on said hollow post, and a cam carried on said cam shaft by which said chuck holding table is raised and lowered on said hollow post.

6. In a machine of the character described,

the combination of a vertical hollow post, a ble, and means for raising and lowering said Vertical shaft journaled in said post, a series radial table on said post.

of drill spindles 0 eratively connected with I said shaft, a radia table concentric with said EDGAR BEMIS' shaft and supported by said hollow post, a Witnesses:

turn table supported on said radial table, RUFUS B. FOWLER, work holding chucks carried by said turn ta- PENELOPE COMBERBAOH. 

